Scalar Equation of a Line Example 3 (KristaKingMath)

How to find the scalar equation of a line with two points.

● ● ● GET EXTRA HELP ● ● ●

● ● ● CONNECT WITH KRISTA ● ● ●

Hi, I’m Krista! I make math courses to keep you from banging your head against the wall. ;)

Math class was always so frustrating for me. I’d go to a class, spend hours on homework, and three days later have an “Ah-ha!” moment about how the problems worked that could have slashed my homework time in half. I’d think, “WHY didn’t my teacher just tell me this in the first place?!”

[mralphs]

You did a great job of determining the equations of the line, however, what you found were the parametric equations of the line, not the scalar equation of the line. The scalar equation of a line is of the form Ax + By + C = 0, where n = [A, B] is the normal to the line and C is a constant.